Composition of matter



Patented Jan. 1928.

UNITED STATES WELLS c. ADAMS, or nn rnorr, MICHIGAN.

No Drawing.

This invention relates to a com osition of matter to be used in. the process tone construction for modulating any tone produced by the horns, amplifiers or sound boards of various kinds of instruments, for instance phonographs, radio sets and musical instru ments. In the construction of, these instruments materials are used for increasing and regulating tones, and my composition may be applied tothe materials, before or after being made into instruments, so that a desired quality or planing of tones may be attained. 1

It is a well known fact that many sound emitting structures have surfaces which cause a. commingling or confusion of sounds, and very often completely change the tone quality of a sound, for. instance, by imparting a metalic or rasping tone to a sound that would otherwise be melodious or natural.

It is to'such surfaces that my composition may be applied to eliminate any intermingling or con-fusion of sound, the composition affording a channel of transmission for sounds so that each sound willbe independent of the other, thus causing natural tones to be emitted without the same being effected by. materials entering into the construction of the instrument. I

My invention aims to provide a composition that maybe applied similar to a varnish or paint, the composition forming a resilient or cushion surfacethat will prevent sound waves from being abruptly deflected or effected by the vibration of materials he composltion consists of a mixture of I pure rubber, gutta perchaybe d,

oil, varnish and litharge.

The rubber serves as a"base or vehicleiof the compound and is preferably pure and liquid emulsion in form. The gutta percha 'is ground'to granular form, and 'prepar Application filed May 13,

forming the instrument from which the" position to impart the tone qualit The composition wil impart ,a surface to the loud speaker whichwill be fiexible or resilient'for'sound deflecting purposes. This has been proven by extensive useof the composition and while it has been COMPOSITION OF MATTER.

1925. Serial No. 30,080.

ing the composition, I prefer to use the ingredlent-s in about the following proportions:

Parts. Rubber emulsion 20 Gutta perrha 2 Beeswax 2 Boiled linseed oil 1 N on-volatile varnish 4 Litharge- 3 In the above composition the rubber emulsion contributes to a non-absorbative cushioning surface and the gutta percha contributes to the body of the composition in the formation of a coating.

The beeswax also contributes to the yield- .in the proportions mentioned above protimes a fine result after all the ingredients are mixed together, subjected to a. heat of approximately one hundred and fifty de-- rees for approximately twenty-four ours, and then placed inxsealed containers for use at any time on the interior surface of any instrument channel or member which A well known type of such emits sounds. sound emitting channel is a loud speaker forming part of the radio set. A

many of these loud speakers are ma e of wood and'metal and it is such materials that may be advantageously coated w1th my comof the loud speaker.

primarily made for application to hornsor oud speakers already in use, yet it may be 3. A sound cushioning coating composition for sound reproducing instruments consisting of fluid rubber, beeswax, an oil drier,'and varnish. 4AA sound cushioning coating composition for sound reproducing instruments consisting of twenty parts fluid rubber, two parts beeswax, an oil drier, and varnish.

In testimony whereof-I eflix my signature.

WELLS 0..ADAMS. 

